Modeling of an atmospheric pressure plasma-liquid anodic interface: Solvated electrons and silver reduction
Abstract
Solvated electrons (eaq−) generated by atmospheric pressure plasmas in contact with liquids are a key source of plasma-induced liquid chemistry that enable applications in biotechnology and nanoparticle synthesis. In this paper, we report liquid phase reactive species concentrations near an anodic plasma-liquid interface as described by a fluid model. In particular, the interfacial structures and plasma-induced reactive species in NaCl and AgNO3 solutions as generated by a pulsed plasma are highlighted. The results show that the magnitude and the penetration depth of the eaq− concentration in AgNO3 solution are smaller than that in the NaCl solution due to the scavenger reactions of eaq− by Ag+ and NO3−. The early products of the plasma-induced Ag+ reduction are also presented, and the impact of the current density, the pulse width, and the AgNO3 concentration on the silver reduction is analyzed. It is further shown that a typical OH radical flux present in such plasmas can highly impact the eaq− concentration and the Ag+ reduction while the impact of vacuum ultraviolet radiation, H, and H2O2 is less pronounced.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Oct 28, 2020
- Source ID
- 10.1116/6.0000575
Entities
People
- Lijun Wang
- Peter J Bruggeman
- Yashuang Zheng
Organizations
- Army Research Office
- University of Minnesota
- Xi'an Jiaotong University